Spiral Rotary Drum Screens

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Spiral Rotary Drum Screens are integrated machines consisting of a drum screen, screw conveyor and compactor.

Product Details

Spiral Rotary Drum Screens are integrated machines consisting of a drum screen, screw conveyor and compactor. Effluent enters the screen drum and solids are captured. When the drum rotates the solids fall into the spiral conveyor. The spiral feeds the screenings into a compactor where they are compressed and disposed. Screen water continues downstream. The rotating screen drum ensures screen does not blind. Filtration rates of between 1 - 7 mm are available, alongside flow rates of up to 7600 m3/h.

Construction
Housing constructed out of high quality 304 stainless steel to ensure years of trouble free operation. Spiral manufactured out of carbon steel with optional 304 stainless steel construction. Nylon cleaning brushes bolted to spiral. Spiral Rotary Drum Screens can be supplied for direct installation into a channel or as a complete package inside a stainless steel tank with or without the option of a bypass rake screen. Continuous bagging systems are available to receive screenings and abate odour, the screenings can then be sealed without any personal contact. Options for 316 Stainless steel area available.


Operation
Solids within the incoming flow will enter into the drum screen and progressively collect onto the screen mesh and cause it to gradually blind. The upstream water level will rise and at a predetermined level, the drum screen and screw conveyor will activate and rotate, immersing a clean section of the screen into the effluent. During rotation the solids or screenings will become inverted and then fall into the screw conveyor. Spray nozzles and a roller brush fixed to the periphery of the drum screen will clean away any residual solids from the mesh surface. The screenings are conveyed, compacted and dewatered and depending upon the solid properties, a volume reduction of around 40% DS or greater can be achieved prior to disposing the screenings into a skip or holding vessel.

A jet wash facility in the compaction zone will breakdown and remove faecal and other semi-solid or soluble mater and return it to the inlet flow. Additional jets can be installed in the transport zone to meet higher specifications of organic solids removal. Faecal matter washing efficiencies greater than 90% and screenings weight reduction of 50% can be achieved. The compactor and wash system can be omitted to suit requirements such as CSO applications where the screenings are returned to the downstream sewer. 


Technical parameter


Model

OA-600

OA-800

OA-1000

OA-1200

OA-1400

OA-1600

OA-1800

OA-2000

Drum diameter

600

800

1000

1200

1400

1600

1800

2000

Standard mesh length

650

850

1000

1200

1400

1500

1650

1850

Outer diameter   of conveying pipe

159

219

219

273

273

325

325

325

Highest water level H3

400

520

670

820

950

1100

1250

1350

Standard installation angle

35°

Average channel depth H2

600-800

700-1000

900-1200

1100-1400

1200-1600

1400-1800

1600-2000

1800-2100

Standard slag discharging   height H1

1000mm

Min.installation length A

3000

3300

3600

4000

4300

4700

5000

5300

Max. flow capacity m3/h

slot

0.5

80

135

235

315

450

585

745

920

1

125

215

370

505

720

950

1205

1495

2

190

330

555

765

1095

1440

1830

2260

3

230

400

680

935

1340

1760

2235

2755

4

235

430

720

1010

1440

2050

2700

3340

5

250

465

795

1105

1575

2200

2935

3600

 
Advantages 

  • High quality and reliability at low cost

  • Protection of downstream plant and drains

  • Easily installed onto an existing or new treatment works

  • Improved Health & Safety with optional continuous bagging

  • Non-clogging even with fibrous materials

  • Reduced disposal costs because of the screenings press

  • High solids capture

  • Enclosed drum screen


Applications

  • Process liquor or fluid screening

  • Municipal waste water treatment works

  • Industrial effluent discharges

  • MBR Membrane pre-screening

  • Commercial outlet discharges

  • Storm flows

  • Sea outfall discharges